Spray device



Nov. 20, 1934.

l.. H. MOORE 1,981,704

SPRAY DEVICE Filed March 29, 1932 2 Sheets-Sheet 1 INVENTOR ATTORNEY Nov. 20, 1934. l., H. MOORE 1,981,704

SPRAY DEVICE 4 Filed March 29, 1932 2 Sheets-Sheet 2 INVENTOR. LIWQEA/Cf H MOORE ATTORNEY.

Patented Nov. 20, 1,934

UNITED STAT-E s! PATENT ori-FICE 1,981,704 n SPRAY DEvICEj s n LawrencelH. Moore, Wichita, Kans. Application y'March zaiszserial Nq. 601,811l s claims. (ci. ,zsi'z4'14o).

This invention relates tospraying devices and the primary objectvis'to vprovide a novel form of s1z rayingl device for delivering liquid inan atom'- ized-orm-frorn a container.

5. Thefdevice is adapted for use inconnection with anykind of liquidv such as fungicides, insecticides, paints and thelike but itis particularly adaptedfor use inl connection with paint spraying devices; According to my invention a wide 10.. swath can be sprayed on trees, flowers, or in the-case of paintv a relatively wide area will bevr covered and while-theinvention was particularly designed for-use in paint-ing railway rolling stock itsadaptabilityior other purposeswillbe obvil5... ousasthe Anature of the vinventionisl better understood, reference being had to thev accompanying" drawings in which: Fig. 1 isa 4side elevational view of a spraying device constructed in accordanceA with my yin- 20..vention.

Fig.r2 is an elevational view of a slightly modified forni of the invention. Fig. 3 is a sectional View through the nozzle and nozzleA litting.

Fig.' 4 is a detail disc.

25; view of one form of mixing Figs isa idngitiidinn 'sectional view throughthejforrnicf nozzle used with the construction shownin Fig; 2; Y y

Fig.. 6. isa sectionaLview on the line 6-6 in Fig. Blandtheiline 6:-"6'in Fig. 5.

Fig. 7 is a longitudinal sectional view through the atomizing gun.

Fig. 8 is an edge view of the gun.

Fig. 9 is a sectional View on the line 9-9 of Fig. 7 showing the gun and trigger lever in elevation.

Fig. 10 is a sectional View on the line 10-10 of Fig. 7.

Fig. 11 is a sectional view on the line 11-11 of Fig. 7.

The liquid, for example, paint, is in a'closed container under pressure and the air is supplied under pressure from any suitable source. There is a ilexble tube 1 connected to the air source and a similar tube 2 connected to the liquid source. These tubes are in turn connected to the gun casing 3 by means of nipples 4 and 5. The ends of the tubes can be fastened to the nipples by clamping bands 6 and 7. The gun casing is provided with an air chamber or bore 8 having two branches indicated at 9 and 10. The air is normally closed off from the branch l0 by a plug valve 11 adapted to be seated on the seat 12 (see Fig. 11). In the branch 9 is a bushing Y opening 32 can be controlledV by; the plug valve 13 having a stuiiing box 14, through which. a valvestem 15--projects. The valve stem carries a Valve 16 adapted to be urged' into closedposition on the end of the bushing by an expansionf spring 17 andit can be moved off its seatvby the trigger lever 18, pivoted at 19 and having a grip handle 20A adjacent to the narrow portion of the gun. When the valve 16 is unseated the.` air can pass through the opening 21v in` the. bushing-into chamber 22 andbe delivered in to the outer air tube 23 mounted in the gun casing. The amount of air passed through the bushing will beV governed by the plug' valve 24 whichcontrols the size of the opening at 21. The plug valve 11 will normally be seated so that air will pass only through vthe bushing. The liquid is delivered into the bore or passageway 25 in the gun casing and into the bushing 26 havingy a stuing box 27 to receive a valvestem 28 provided with a valve 29 to close the end. of .the bushing bythe spring 30. The valve can be kun. seated bythe trigger lever 18 which has a'. screw adjustment 31 to vary the amplitude of move-` ment of the valve. The air valve will be openedA` slightly in advance of the liquid valve and when the valve 29 is unseated the liquid will pass into the bushing out through opening 32 intoy chamber 33 to discharge intothe inner tube .34 surrounded? bythe tube 23. Theeffective portparea .of the..

35r-(see.Fg. 10)... It..will.benoticed that the. trigger .lever .has a curved .offset portion-36.10 allow it to clear the tube 23. The tube 23 is connected to a nozzle cap 37 (see Fig. 3) to deliver air to the passageway 38, 39, through the perforated conical disc 40, and out through the nozzle 41 screwed thereon.

The disc is provided with notches 42 and 43 to allow the disc to be inserted in the cap. The notches receive the projections 44 and 45 and 95 then by turning the disc the cam edges adjacent to the disc will ride under the projections to securely hold the disc in place. This will be effected because the projections are in the form of heads which can overlap the cam edges of the disc as shown in Fig. 6. The liquid is delivered through the tube 34 to passageway 46 to the chamber 47 where it is mixed with the air and the combined air and liquid is forced together in a commingled state through the orice in the disc 40 so that the air will carry the liquid through the slit 48 in the nozzle. The edge of the slit is iiared and the slit extends practically across the face of the nozzle so that a relatively wide atomizing swath is provided. The plug 49 is provided so that the passageway 39 can be cored or drilled and then the end is closed.

From the foregoing it will be apparent that the air and liquid Will be delivered to the nozzle under pressure where the uid will be broken up and commingled by the disc causing the liquid to be discharged in an atomized condition under pressure. The tubes 23 and 34 will ordinarily be long enough so that the nozzle may be swung to deliver paintor other liquid over a relatively wide area Without the necessity of the operator changing his position. When it is desired to clean the gun and particularly the nozzle, the valves 16 and 29 will be seated and the operator will unseat the plug valve 11 manually so that air blown up through the paint tube 34 will force all accumulations out of the tube and out of the nozzle. This is an important feature of the invention because it eliminates the possibility of any of the passageways or the nozzle becoming clogged.

In Fig. 2 I have shown a modiied form of spraying device in which the air tube 50 is provided with a hand valve 51 and the paint tube 52 is provided with a similar valve 53. These tubes are associated with a slightly modied form of nozzle cap shown in Fig. as receiving the threaded ends of the tubes 50 and 52 and having a chamber 54 provided at one end with a web 55 having a central opening 56 adjacent to the disc 57 which can correspond in structure to the disc shown in Fig. 4.

The nozzle ll is the same construction as the nozzle shown in Fig. 3. The structure disclosed in Figures 2 and 5 is a less expensive one than that previously described and by reference to Fig. 5 it will be obvious that the liquid and air will merge in the chamber 54, pass through the opening 56 and be commingled by the perforated conical disc 5'7 so that the liquid will emerge through the nozzle opening in a ne spray providing a relatively wide swath. The proportions of air and liquid as well as the volume passing through the pipes or tubes and 52 will be controlled by the hand valves 51 and 53.

In actual practice I have found that the best results are obtained by proportioning the port 39 with port 48 in Fig. 3 or port 56 with the outlet port of nozzle in Fig. 5 so that the proper amount of air and liquid will be passed through 'Ato effect the desired atomization. For example,

if the port 39 or 56 is too large, an excess amount of paint will pass up into the head so that the requisite spray will not be had, in other words, the liquid will flood the head and it will be discharged in too solid a stream. If the ports 39 and 56 are very much smaller than the outlets for the nozzles then the mixture will be so lean that very little paint will be carried through the head with the result that the surface will not be properly covered. Therefore I recommend that the ports 39, 56 or their equivalents be approximately of the same cross sectional area as the outlet for the nozzle. A good example is to have the ports 39 or 56 be 75 in diameter and to have the outlets for the nozzles of substantially the same port areas. In my own experience this has given the best results, altho it may be foundthat slight deviations from the abovel recommended proportions can be had .without materially affecting the results.

What I claim and desire to secure by Letters Patent is:

l. A liquid spray device, comprising a head having a liquid inlet and an air inlet discharging into a mixing space, a nozzle on the head having a discharge opening communicating with the mixing space, a wall between the mixing space and the nozzle having openings through which the liquid and air pass to the nozzle, said Wall consisting of a concavo-conVex-disc, the concave portion being directed toward the nozzle, and a perforated wall in spaced relation with the first named Wall in advance of the mixing space.

2. A liquid spray device, comprising a head having a liquid inlet and an air inlet discharging into a mixing chamber, a nozzle discharge for the head, a wall in the head in advance of the mixing chamber having an opening, and a perforated wall spaced from the rst named wall between said Wall and the nozzle discharge.

3. A liquid spray device comprising a head hav` ing a liquid inlet and an air inlet discharging into a mixing space, a nozzle on the head having a discharge opening communicating with the mixing space, a concavo-convex wall between the mixing space and the nozzle having openings through which the liquid and air may pass to the nozzle and a wall between the concavo-convex wall and the mixing space having a central opening concentric with the center of the concavo-convex wall.

LAWRENCE H. MOORE. 

